The substance binds to the protein carrier on the low concentration side and using energy from respiration.

这种物质结合在低浓度的蛋白质载体上，利用呼吸产生的能量。

The protein carrier releases the substance on the other side of the cell membrane, where it is already at a high concentration.

蛋白质载体将这种物质释放到细胞膜的另一边，在那里它已经处于高浓度。

Active transport is carried out by protein carriers within the cell membrane, and they have a specific binding site for the exact molecules they are transporting.

主动运输是由细胞膜内的蛋白质载体进行的，它们对所运输的分子有特定的结合位点。